Adjustable shelf bracket



FIG. 1 is a right side elevational view of an adjustable shelf bracket showing my new design;

FIG. 2 is an inverted left side elevational view thereof;

FIGS. 3 and 4 are respectively top and bottom plan views thereof; and

FIGS. 5 and 6 are respectively front and rear elevational views thereof. 

The ornamental design for an adjustable shelf bracket, as shown. 